Surgical air turbine unit



Nov. 9, 1965 D. ROTH ETAL 3,216,442

SURGICAL AIR TURBINE UNIT Filed May 26. 1961 6 Sheets-Sheet 1 JNVENTORSDAN/EL E0 7%! a! 2085: M4. fi/Au.

THE/e A rraeuer Nov. 9, 1965 D. ROTH ETAL SURGICAL AIR TURBINE UNIT 6Sheets-Sheet 2 Filed May 26, 1961 INV TORS gANIEL E; 72 user 4 a I M7ZlE/2A7'7'0EUEY Nov. 9, 1965 D. ROTH ETAL 3,216,442

SURGICAL AIR TURBINE UNIT v Filed May 26, 1961 6 Sheets-Sheet 3 M 4 Fig.5

DAN/El. AW 2 Ease/er M. H441.

THE/R Am Nov. 9, 1965 D. ROTH ETAL 3,216,442

SURGICAL AIR TURBINE UNIT Filed May 26, 1961 6 Sheets-Sheet 4 JNVE TORSDAN/1. Ea TH @QJEMM HALL 72mm A rraeusv Nov. 9, 1965 D. ROTH ETALSURGICAL AIR TURBINE UNIT 6 Sheets-Sheet 5 Filed May 26, 1961 IN V Elg0R5 THE/E A rmeusv Nov. 9, 1965 D. ROTH ETAL.

SURGICAL AIR TURBINE UNIT 6 Sheets-Sheet 6 Filed May 26, 1961 INVEN 0R5DAM/4 Ear J Roam 77W. ALL 5,

United States Patent C) 3,216,442 SURGICAL AIR TURBINE UNIT Daniel Roth,Pittsburgh, and Robert M. Hall, Rosslyn Farms, Pa; said Both assignor toPflltB-Dllll, Inc., Pittsburgh, Pa., a corporation of Pennsylvania FiledMay 26, 1961, Ser. No. 112,864 5 Claims. (Cl. 137-209) This inventionrelates generally to surgical and dental operating units for drivingturbo jet rotary surgical cutters and more particularly to a portableoperating unit that is simplified and capable of being autoclavible forsurgical use within the operating area of an operating room.

The dental turbo jet drill has opened up an entirely new field insurgery. However, being developed primarily from the dental view pointthe operating structures are enclosed in large cabinets that may bewheeled around the room but they are not permitted within the operatingarea as they contain electrically operated valves and other similarcontrols that are not autoclavible. Again the use of electricallyoperated cutters and drills is very dangerous in an operating room whichfrequently contains ether. The explosion hazard is too much of a riskfor an operating room.

The dental turbo jet drill has passed beyond the tooth and jaw bone workof oral surgery. It is now finding use to remove or cut away bone in allparts of the body. It is used to cut calcium from the heart valves or onjoints, drill holes through rib bones to draw them back together afterthey have been stretched to operate on the heart which avoids pinching anerve running along the edge of the rib, for cutting through the skullthis fast surgical cutter has many more uses in surgery than in thefield of dental surgery and it is to this end that this invention forthe control and supply unit is directed.

The principal object of this invention is the provision of a control andsupply unit for turbo jet rotary surgical cutters that is fullypneumatic and is not dependent upon any other source of power butcompressed gas such as air.

Another object is the provision of a turbo jet rotary surgical cuttercontrol and supply that is portable. This unit can be readily carried bythe doctor to the place Where the drill is to be used. It may be used inthe home, in the ofiice, in the hospital room. All that it needs is asupply of gas which can be air or oxygen from a bottled source, or theusual piped air found in doctors ofiices, clinics or operating rooms. Itis usually in the wall and with the aid of a quick detachable plug thesource of supply of pneumatic pressure is available. A small bottle ofcompressed air may run the turbo jet for three or more hours and it isreadily carried as it usually weighs less than twenty pounds.

Another object of this invention is the provision of a control andsupply unit for turbo jet rotary surgical cutters that is completelyautoclavible. This entails a connection for attachment to a source ofpneumatic pressure that ordinarily has a control valve that may be usedto turn the turbo jet on or off and actually control the desired speed.Frequently this is all the control that is needed. If on the other hand,one wishes to use a variable pneumatic control operated by the foot thena foot paddle control valve is mounted in the supply line of pneumaticpressure which is operated by the person using the surgical cutter whichvalve in turn is connected to the supply unit containing a tank and anoil dispenser and which may or may not be used with a direct pneumaticconnection. A surgical turbo jet cutter invariably needs liquid to coolthe cutter and wash the area clear. Air or gas is also preferably usedfor the same purpose but need not be supplied. Most turbo jet cutterhandpieces have four holes, two on opposite sides of the rotary shank,one on each side for water and gas such as air. These holes or nozzlesdirect their fluid under m 3,216,442 C Patented Nov. 9, 1965 pressure tothe drill, cutter or stone and cover most of the area on which it isused keeping the same visible. Thus the control valve and its hoseconnections together with the supply unit may be steam autoclavedwithout injuring the apparatus and permitting this light and compactunit to be in the operating area with the other surgical tools. Thiscomplete portable, pneumatic, and autoclavible control and operatingunit is simple, economical and readily transportable. It of course, isalso readily sterilizable in a gas autoclave but many hospitals willaccept only a steam autoclavible apparatus.

The simplicity in providing one unit that is readily transportable is aconsiderable advancement in the art when one visualizes the dentalstationary apparatus for the supply unit of a rotary turbo jet drill.

Another object is the provision of a control that will stop the flow ofwater from the nozzle in the handpiece immediately upon the valving oifthe pneumatic pressure operating the turbo jet surgical cutter. If nocontrol for this feature is provided the water in the tank being underpressure will flow until the chamber pressure is depleted for a shorttime. It is not objectionable but when handing the tool back to thesurgical tray it may still be spitting water. This control isaccomplished by placing a bleeding hole in the air line just beyond thecheck valve and before the air line enters the water chamber or where itenters the water chamber or tank. This bleeding hole can be of fair sizesuch as No. 20 drill, or very small such as the size of a No. 60 drill.If this hole is placed away from the air inlet then it will not functionproperly as it exhausts the tank pressure. Thus the mere provision of ableeding hole at the air inlet on the water tank or chamber side of theair supply check valve provides proper control of the flow of water atthe turbo jet drill or cutter.

Another object is the provision of a simplified water control.Frequently operators feel that they may need more or less water on thecutter. If the speed is substantially constant the water supply needonly be constant and in place of providing a needle valve whichcomplicates the device the water outlet from the water tank or chambermay be controlled by an orifice thus eliminating the needle valve.

Another object is the improvement of the oil distributor control. Oneform of controlling the oil distribution is by exposing a metallic wick,the other end of which is suspended in an oil reservoir, to a cross flowof air. The air directly crossing the oil chamber impinges on thesaturated wick and passes therearound and out the other side. The amountof oil picked up by this air may be controlled by the amount of oilsaturated wick exposed. It has been found that the maximum exposure ofthe wick does not supply too much oil in the air that drives the turbojet. Thus no control is necessary thereby simplifying the apparatus.

Another object is the provision of a supply unit containing a waterchamber and the oil distributor which consists of a head block of metalsuch as stainless steel or die cast steel which has a distributingpassage with a quick joint to connect to the pneumatic supply underpressure. This passage has a lateral connection containing a check valveand leading to one side of the block through a large cylindricalthreaded projection that is almost the size of this block. The threadedportion receives one end of a stainless steel cylinder the bore at bothends of which is threaded, one to receive the head block, the other toreceive a large plug removable to form a water tank or chamber and toclean or assemble the unit. These threads may be sealed with O-rings.The top of the cylinder has a threaded hole to receive a threadedfunnel-shaped filler into which water may be poured. The block has anoil chamber which is closed by a plug at the top and is provided with anexposed wick critical.

suspended in an oil reservoir but sealed from a cross air fiow passageextending from the distributing passage through the oil distributingchamber to a connection for the handpiece. The distributing passage thatdirectly connects through the block the connection for the handpiece.The last passage is from the tank side of the block just off the bottomof the tank directly to the connection for the handpiece. This passagemay be con trolled by a fixed orifice or passage size on a valve such asa needle valve the control of which extends to the surface of the block.Thus the cylinder may be dismounted and the block fully opened forcleaning, inspection or replacement of the check valve which is insertedfrom the tank side of the block. With the pneumatic quick jointconnection on one side and the three passage quick joint connection onthe other side of the block for the handpiece,

this unit may be steam autoclaved without the lines connected thereto.Only one control, the water needle valve need be exposed but if a fixedorifice is used then there is no need for any controls on this block.

Other objects and advantages of the invention appear hereinafter in thefollowing description and claims.

The accompanying drawings show for the purpose of exemplificationwithout limiting this invention or the claims thereto, certain practicalembodiments illustrating the principles of this invention, wherein:

FIG. 1 is a perspective view of an open supply unit 3 comprising thisinvention with parts broken away.

FIG. 2 is a perspective view of the closed supply unit with a carryinghandle and connected to a foot valve control.

FIG. 3 is a view in vertical section of a modified form of supply unit.

FIG. 4 is a view in horizontal section of the supply unit showing thewater pressure and air supply.

FIG. 5 is a partial sectional view of the head block showing the waterconnection.

FIG. 6 is a view in front elevation of the head block showing an oilreservoir window.

FIG. 7 is a plan view of the supply unit comprising this inventionhaving a control valve.

FIG. 8 is a view in vertical section of a head having a water supplyvalve.

FIG. 9 is a plan view of FIG. 8.

FIG. 10 is a view in front vertical section of FIG. 8.

FIG. 11 is a view in partial vertical section of the supply head showinga fluid control valve.

FIG. 12 is a view partly in section of a handpiece showing the remotefluid actuated valve control.

Referring to FIGS. 1 and 2 the supply unit 1 comprises the casing madein two sections 2 and 3, the bottom section 2 is provided with thebottom plate 4 and the end walls 5 and 6 which are provided with themarginal flanges 7. The top member 3 is a U-shaped metal arranged tohave its sides 8 to slip down inside of the flanges 7 and strike theupper surface of the bottom plate 4 and be secured to the flanges 7 forthe purpose of holding the top and bottom sections of the housingtogether. The top housing section 3 is provided with a handle asindicated at 10 that is secured for the purpose of lifting andtransporting the supply unit.

As shown in FIG. 1 the supply unit consists of pneumatic inletconnection 11 which is directly connected to the T-member 12 providingthree branches. One branch 13 connects with the check valve 14 fordelivering gas under pressure such as air passed the check valve 14 andthe elbow member 15 and downwardly into the top of the cylindrical tank16 which provides a chamber for the storage of sterile water or otherliquid that may be employed in combination with a rotary turbo jetsurgical cutter. Sometimes a saline solution is employed and sometimesanesthetizing solution may be employed. Just before the passage 13enters the tank 16 a small bleed hole 17 is provided. The size of thehole is not It can be drilled with a number 60 drill or it 4 may be aslarge as a number 30 drill. However, a 60 drill hole provides anadequate bleed off and is found to work properly. If this bleed off wasplaced other than in the air supply passage 13 to the tank 16 it willnot function as well. The whole purpose of the bleed off hole is toimmediately release the air in the sup-ply line 13 passed the valve 14,when the foot valve 18 has been closed to shut off the supply to theinlet connection 11. The air supply being transmitted from a bottlesource of air or a permanent air line such as found in a hospitaloperating room is provided with a quick connector 20 to conduct the airthrough the tube 21 to the foot valve 18 and by regulating this valveone may regulate the air passage from the line 21 to the line 22 andthence to the air supply connection 11 of the supply unit 1. The airthat is conducted through the passage 13 to the water is thus bled fromthe line to relieve the tank 16 of pressure when the valve 18 is closed.This prevents a dribble of the liquid from the tank at the surgicalcutter after valve 18 has been closed.

The tank is filled with water or other suitable liquid by means of thefunnel shaped inlet 23 that is secured to an opening in the wall at thetop of the tank 16. A suitable cap 24 is threadably mounted on the waterinlet funnel member 23 for closing the tank. The top of the housing part3 is provided with an opening 25 to pass the water inlet funnel member23. The end wall 2 is likewise provided with an opening such asindicated at 26 to allow the threaded end of the quick coupling member11 to be inserted or secured to the supply line within the housing.

The water outlet pipe 27 opens in the tank 16 adjacent the bottomthereof, its mouth being raised above the bottom surface so as not totake any water after a specific predetermined depletion of the supply ofwater in the tank has been withdrawn. This avoids the water line frompicking up any foreign matter in the bottom of the tank. The outlet pipe27 is connected to the elbow 28 which extends through the horizontalsection 30 to the valve 31 which is preferably a needle valve to controlthe flow of water and the vertical section 32 into the distributingblock 33. Likewise the passage 34 from the T- member 12 passes throughthe elbow 35 and the vertical section of line 36 to the block 33. Thethird passage from the T-member 12 passes directly into the cylindricaloil distributor 37 that has an exposed wick in the center of its chamberand across which the stream of air is required to flow to pass outthrough the line 38 to the block 33. The oil chamber has an exposed wick40 preferably of a metal wire mesh material capable of raising oil bycapillary attraction from the reservoir 41 in the bottom of the glassbottle 42 at the lower end of the cylindrical oil distributor 37. Asshown in FIG. 2 the glass bottle is exposed through the window 43 todetermine the depth of oil in the reservoir 41. This reservoir is filledthrough the capped spout 44. As shown in FIG. 3 the wick 40 extendsupwardly through the tube 45 which tube is sealed with the containerabove the filling spout 44 so that if the supply unit is inverted theoil will not run into the chamber 46 in which the wick is exposed. Theplug 47 that encloses the end chamber 46 in the top of the cylindricaloil distributor 37 has an adjustable stop 48 on its under side to engagethe top of the wick 40 and limit its upward extension from the tube 45.This wick 40 is provided with a spring on the lower end of the tubewhich is open into the reservoir 41 to maintain the wick 40 against thestop 48. As shown in FIG. 3 the wick is substantially fully extendedwhich is the preferred position.

Thus the air traveling through the line 38 picks up oil for the purposeof supplying the same to the turbo jet in the handpiece that rotates thesurgical cutter.

As shown in FIG. 1 the manifold block 33 has the lines 32, 36 and 38connected to a conical reducing member 50 the outer end of which isthreaded as indicated at 51 to receive a quick coupling member for thepurpose of con necting each of the three passages 32, 36 and 38 to aflexible hose for conducting the air with the 'oil, the air alone andthe water under pressure to the handpiece. The air with the oil rotatingthe turbo jet whereas the air and the water function as cooling andcleaning the surface being removed by the surgical cutter. The side 8 ofthe top housing section 3 has a large hole 52 into which a couplingmember may be inserted and the sleeve threaded onto the section 51 forlocking the same in place.

This unit as shown may be steam autoclaved together with the lines 21and 22 and the intermediate foot valve which would permit the supplyunit to be within the operating area.

Referring to FIGS. 3 and 4 the modification herein shown of the supplyunit is preferably made from stainless steel and includes the head block53 having passages bored therein. The back of the head block is providedwith a cylindrical extension 54 that is threaded as indicated at 55 toreceive the threaded end of the stainless steel tube 56 that forms thetank or liquid reservoir. The opposite end of the tube 56 is threaded asindicated at 57 to receive the threaded plug 58 which is provided with ahandle for unscrewing the plug from the bore of the tube 56. In the plug58 and the head 53 annular grooves are provided for receiving theO-rings 59.

When the tube 56 is screwed until it abuts the shoulder on the headblock the top of the head block 53 represents the top of the cylinder 56Which is provided with the threaded opening 60 to receive the threadedfunnel shaped liquid inlet 61 closed by the threaded cap member 62.

A handle for purposes of carrying such as indicated at 63 may be weldedor threadably secured to the tube as indicated at 64 and in line withthe liquid inlet at the top of the tube 56.

As shown in FIG. 4 the air supply inlet 11 is threaded to receive aquick connector from the end of the flexible hose member 22 or a similarhose member that connects directly to the air supply quick joint member20. The air upon entering from the flexible hose passes into themanifold passage 65 which has a branch 66 leading to the chamber 46where the air impinges directly on the metal wick 40 that is extendingfrom the tube 45 that passes downwardly to the bottom of the chamberwhich functions as an oil reservoir. The tube 45 in turn is secured tothe plug member 67 which defines the bottom of the chamber 46 and sealsthe same from the oil reservoir.

After the air impinges on the wick 40 it breaks up and passestherearound picking up oil and is discharged through the horizontalpassage 68 which terminates in the vertical passage 69 that is closed atthe top of the head 53 by the plug 70 as shown in FIGS. 3 and 5. Thisoil bearing air then passes downwardly through the passage 69 to theoutlet 70' in the hose line connector 71 as shown in FIGS. 3, 4 and 6.

The passage 65 continues to the passage 72 at right angles thereto asshown in FIG. 4 that extends through the threaded plug section 54 and isprovided with a larger bore for receiving the check valve 73. The airupon passing the check valve then flows into the top of the chamberformed by the tube 56. As illustrated in FIG. 3 a small bleed line 74extends from the enlarged bore to the exterior of the block 53 asillustrated in FIG. 7. This is the bleed passage that corresponds withthe bleed passage 17 of FIG. 1.

A diagonal passage 75 extends from the manifold 65 downwardly to theopening '76 in the hose line connector 71 as shown in FIGS. 3 and 6.

An upwardly extending diagonal passage 77 connects with the inner lowerend of the chamber formed by the tube 56 upwardly and terminates at theopening 78 in the connector 71. As shown in FIG. 3 the line 77 before itconnects to the chamber of the tube 56 is provided with a removableorifice. This removable mem- 5 her which has a predetermined orificewill admit only a certain amount of water therethrough at a given timeand thus fixes the flow of water to be employed in cooling the surgicalcutter. As shown in FIGS. 1 and 8 to 10 this line 77 has the removablepredetermined orifice member 79 omitted and in its place is provided aneedle valve 80 which is properly sealed within a vertical bore in theblock 53 and is provided with a control handle 81 at the top of theblock as illustrated in FIGS. 8 and 9. Thus one may regulate the amountof water supplied for cooling the rotary surgical cutter.

Through long usage it has been determined that a single high speed forthe turbo jet rotary surgical cutter is ideal for most purposes and thesame is true insofar as the supply of air and water for cooling thisrotary cutter. Thus the orifice 79 which determines the amount of wateradmitted for a given pressure together with the size of the airdischarge 76 properly limits the supply of the cooling water and air tothe handpiece and thus greatly simplfies the structure.

In this structure shown in FIG. 7 a spring loaded valve member isoperable to close the manifold passage 65 before it reaches the firstbranch 66. This valve is shown at 8 2 and is spring loaded to maintainthe passage 65 open. A lever 83 is pivotally supported on the pivotmember 84 attached to the top of the head 53 allowing the lever to swingout over the valve '82. The outer end of the lever 83 is provided with abifurcated hook 85 which receives the handpiece member 86 that isconnected by the flexible hose '87 to the complementary part 88 of theconnector 71. Thus when the handpiece 86 is placed on the hook 85 itwill depress the lever 83 and close the valve 8'2 to stop the supply ofpneumatic pressure to the manifold '65 and thus arrest the rotation ofthe turbo jet surgical cutter.

As shown in FIG. 5 the valve '82 is provided with a handpiece and isthreadably actuated to manually close the manifold 65.

Referring to FIG. 11 the block 53 is provided with the vertical bore 90which would receive the valves 82 in the structures shown in FIGS. 5 and7 but in this case receives the valve 91 which slidably closes themanifold 65. This valve member '91 is connected to the valve operator 92by means of the rod 93 that extends therebetween and is connected to thesame. Above the valve 91 is provided a spring 94 which is seated againstthe removable-plug 95 and bears against the valve 91 to force the samedownwardly until it is stopped by the seat 96 in the bottom of the bore90. A smaller bore 97 extends down to the horzontal pasage 98 that isparallel and lies directly under the manifold passage 65 and thusproceeds to the center of the block where it is connected by theoutwardly extending passage 100 wherein the passage 98 is closed by theplug valve 102 and when the complementary part 88 is attached to theconnector 71 each of the four openings 70, 76, 78 and 100 are connectedto their associated independent lines in the hose member 87 as shown inFIG. 12 where the opening 70' connects through the line directly to anozzle to discharge the oil bearing air against the small buckets 103 ofthe turbo jet rotor 104 to rotate the surgical cutter 105 in thehandpiece 86. A series of two holes is placed on each side of the turbojet as indicated at the locations 106 which direct the cooling air andwater to the cutter 105 as indicated by the dotted lines depicting theflow streams.

The handpiece 86 has a window 107 which exposes the bulb 108 that isconnected directly to the opening 100. When the handpiece and itsconnector 88 is secured to the complementary connector 711 all thepassages including the bulb 108 and the hose connections extending backto the connector 71 together with the passages 97 and 98 are filled withan actuating fluid such as oil through the plug valve 102. When thehydraulic system is being filled the air may be bled therefrom throughan exhaust in the instrument filling the same to insure that the systemis completely filled with a hydraulic fluid. The filling device is thenremoved from the valve plug i102 and the pressure in the system isinsuflicient to lift the valve operator 9 2 off its seat 96. However,when one depresses the bulb 108 in the handpiece the valve 91 is raisedcompressing the spring 94 and thereby opening the manifold v65 to allowthe pneumatic pressure to enter the same. This of course immediatelystarts the turbo jet and the supply of the cooling air and water fromthe four jet openings which direct their respective sprays to thesurgical cutter 105. Thus the surgical cutter will continue to rotateand be supplied with air and water as long as the operator depresses thebulb 108 in the handpiece. However, releasing the bulb 108 the pressureof the spring 94 pushes the valve 91 close-d and the operating piston 92then returns the liquid to the system and thus stops the rotation of theturbo jet surgical cutter and also stops the flow of air and water. Thebleeder passage 74 shown in FIG. 3 allowing the entrapped air toimmediately escape from the chamber formed by the cylinder 56 causes thewater to immediately stop from issuing in the nozzle directed to therotary surgical cutter. Any leakage of air past the valve 91 will bevented through the vent '109 as shown in FIG. 11.

If it is desired not to employ the chamber 46 as the oil distributorthen a glass type oil distributor such as illustrated at 42 in FIG. 6may be employed which has an upper metal member 37 that is provided withthe chamber which contains the tube 45 with the projecting wick 40 andis also provided with a filling spout 44. The metal member 37 isprovided with a pair of O-rings such as illustrated at 5110 which sealoff the connection between the passages 66 and 68 to the bore in thehead 53 that receives the bottle 42. As illustrated in FIG. 6 the faceof the head 53 is slotted as indicated at 11 1 to expose the bottle sothat the depth of the oil in the reservoir 41 thereof may be visuallychecked. The slot 111 also permits this filling spout 44 to be sliddownwardly in place. Thus the oil reservoir in this instance may beremoved entirely from the block, whereas in the structure shown in FIGS.3 and 4 merely the interior of the oil reservoir structure and wick isremovable and sealed within the bore.

We claim:

1. A portable compact autoclavible unit for supplying operating fluidunder pressure to a handpiece having a rotary turbojet surgical cutter,consisting of a unit, a pneumatic pressure inlet connection to saidunit, a supply line attached to said inlet connection, valve means insaid supply line to control fluid under pressure to said inletconnection, an output supply connection on said unit and including aplurality of independent fluid supply lines, a refillable oiler in saidunit having a closed chamber containing an oil distributor, a passagefrom said inlet connection to said oil chamber, an outlet from said oilchamber to one of said independent supply lines as the first of saidsupply lines for said output supply connection, a liquid supply tank insaid unit having a removable closure to fill the same, a tank pressureinlet above the tank liquid level and having a check valve, a secondpassage from said inlet connection to said tank inlet through said checkvalve, a constantly open atmosphere bleeding orifice connected betweensaid tank pressure inlet and said check valve, a control tank outletbelow the liquid level of said tank to said output supply connection asthe second of said independent supply lines of said outlet supplyconnection to supply cooling liquid, and a third passage from said inletconnection directly to said outlet supply connection as the third ofsaid independent supply lines of said output supply connection to supplycooling air.

2. The portable compact autoclavible supply unit of claim 1 which alsoincludes a cylinder for said tank, a block manifold connected with saidcylinder for said inlet and outlet supply connections to retain each ofthe passages therefor, plug means carried by said cylinder for closingsaid cylinder making it a pressure vessel, said removable closure tofill said tank carried by said cylinder.

3. The portable compact autoclavible supply unit of claim 1 which alsoincludes a cylinder for said tank, a block manifold closing one end ofsaid cylinder and containing said inlet and output supply connectionsand all of said passages, plug means closing the other end of saidcylinder.

4. A portable compact autoclavible unit for supplying operating fluidunder pressure to the fluid actuated rotary turbo surgical cutter,consisting of, a unit having a supply inlet for receiving gas underpressure, valve means in said unit to control the supply of gas to saidsupply inlet, a refillable liquid chamber in said unit having a fluidpressure inlet with a check valve and connected to said supply inlet, acontinuously open atmospheric bleeding orifice connected between saidchamber and said check valve in said chamber fluid pressure inlet, achamber outlet of predetermined size from adjacent the bottom of saidchamber to supply liquid under pressure as a cooling liquid, an oildistributor in said unit connected with said supply inlet to supply gascarry ing oil as a turbo operating fluid, and a direct connection fromsaid supply inlet to supply gas as a cooling fluid.

5. The portable compact autoclavible supply unit of claim 4 which alsoincludes valve controlling means and a control line therefor connectedto said valve means to actuate the same and control the supply of gas tosaid supply inlet in said unit.

References Cited by the Examiner UNITED STATES PATENTS 1,822,743 9/31Mitchell 239348 2,243,435 5/41 Mott 239347 2,439,910 4/48 Snyder l84-552,764,177 9/56 Paasche 137-209 2,850,323 9/58 Veres 184-55 XR 2,868,5841/59 Faust.

2,878,895 3/59 Wiley 184-65 2,895,684 7/59 Harr 239549 XR 2,924,880 2/60Ziegler 3228 2,991,944 7/61 Sullivan 239422 XR FOREIGN PATENTS 849,3249/ 60 Great Britain.

WILLIAM F. ODEA, Primary Examiner.

ISADOR WEIL, M. CARY NELSON, ROBERT E.

MORGAN, Examiners.

4. A PORTABLE COMPACT AUTOCLAVIBLE UNIT FOR SUPPLYING OPERATING FLUIDUNDER PRESSURE TO THE FLUID ACTUATED ROTARY TURBO SURGICAL CUTTER,CONSISTING OF, A UNIT HAVING A SUPPLY INLET FOR RECEIVING GAS UNDERPRESSURE, VALVE MEANS IN SAID UNIT TO CONTROL THE SUPPLY OF GAS TO SAIDSUPPLY INLET, A REFILLABLE LIQUID CHAMBER IN SAID UNIT HAVING A FLUIDPRESSURE INLET WITH A CHECK VALVE AND CONNECTED TO SAID SUPPLY INLET, ACONTINUOUSLY OPEN ATMOSPHERIC BLEEDING ORIFICE CONNECTED BETWEEN SAIDCHAMBER AND SAID CHECK VALVE IN SAID CHAMBER FLUID PRESSURE INLET, ACHAMBER OUTLET OF PREDETERMINED SIZE FROM ADJACENT THE BOTTOM OF SAIDCHAMBER TO SUPPLY LIQUID UNDER PRESSURE AS A COOLING LIQUID, AN OILDISTRIBUTOR ON SAID UNIT CONNECTED WITH SAID SUPPLY INLET TO SUPPLY GASCARRYING OIL AS A TURBO OPERATING FLUID, AND A DIRECT CONNECTION FROMSAID SUPPLY INLET TO SUPPLY GAS AS A COOLING FLUID.